@misc{indiciaedcbfc500c838,
  title = {Comments on the communication and data problems associated with a Mars trip during a conjunction phase.},
  author = {Hoagland, J. C. and Nason, W. D.},
  year = {1967},
  url = {https://ntrs.nasa.gov/citations/19670041141},
  note = {Source identifier: 19670041141}
}